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tl: add some implication-based rewritings for "<->", "->", and "xor"

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This prevents an exception from being raised if NNF is not performed
on Boolean properties and implication-based checks are used.

* NEWS: Mention the issue.
* spot/tl/simplify.cc, doc/tl/tl.tex: Add some rules.
* tests/python/ltlsimple.py: Test them.
This commit is contained in:
Alexandre Duret-Lutz 2018-08-01 15:00:45 +02:00
parent d8419db618
commit 126d392355
4 changed files with 113 additions and 58 deletions
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22
tests/python/ltlsimple.py
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@ -1,6 +1,6 @@
# -*- mode: python; coding: utf-8 -*-
# Copyright (C) 2009, 2010, 2012, 2015 Laboratoire de Recherche et Développement
# de l'Epita (LRDE).
# Copyright (C) 2009, 2010, 2012, 2015, 2018 Laboratoire de Recherche et
# Développement de l'Epita (LRDE).
# Copyright (C) 2003, 2004 Laboratoire d'Informatique de Paris 6 (LIP6),
# département Systemes Répartis Coopératifs (SRC), Université Pierre
# et Marie Curie.
@ -116,3 +116,21 @@ Default for shell: echo 'a U (b U "$strange[0]=name")' | ...
LBT for shell: echo 'U "a" U "b" "$strange[0]=name"' | ...
Default for CSV: ...,"a U (b U ""$strange[0]=name"")",...
Wring, centered: ~~~~~(a=1) U ((b=1) U ("$strange[0]=name"=1))~~~~~"""
opt = spot.tl_simplifier_options(False, True, True,
True, True, True,
False, False, False)
for (input, output) in [('(a&b)<->b', 'b->(a&b)'),
('b<->(a&b)', 'b->(a&b)'),
('(a&b)->b', '1'),
('b->(a&b)', 'b->(a&b)'),
('(!(a&b)) xor b', 'b->(a&b)'),
('(a&b) xor !b', 'b->(a&b)'),
('b xor (!(a&b))', 'b->(a&b)'),
('!b xor (a&b)', 'b->(a&b)')]:
f = spot.tl_simplifier(opt).simplify(input)
print(input, f, output)
assert(f == output)
assert(spot.are_equivalent(input, output))